JPS60150616A - Capacitor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to high voltage capacitors.

Conventional structure and its problems Conventionally, the structure of this type of capacitor is as shown in FIG. , or metal PJ2 formed by vapor deposition etc. in the length direction.

The required interval 3 is maintained. These metals Mj2 are arranged as individually insulated electrodes, and each metal layer 2 is arranged so as to partially face the electrodes made of two metals M4 adjacent to each other on the other surface of the dielectric film l. are doing. The dielectric film l having the metal layer 2 and the electrode 4 on both sides and the dielectric film 5 are stacked and rolled into a roll.
It constitutes a rotating capacitor.

At this time, as shown in FIG. 2, the electrodes are drawn out at the beginning and end of the winding by using a metal foil 6 for at least one of the electrodes that partially opposes the part, and placing a lead on the surface of the metal foil 6. Wires 7 and 8 were welded.

In this type of capacitor constructed as described above, the metal layers 2 and 4 on each side arranged with the dielectric film 1 in between are two adjacent metal layers 4 on the other side.
．． 4 N faces a part of 2.2, and is equivalent to capacitors C1, C2, C3, . . ., Cn shown in FIG. 3 connected in series. Each capacitor CI, C
2, C3...Cn has Vl, V2, v3... into which the voltage Vs applied between the lead wires 7.8 is divided.
. . . Since Vn is applied, the withstand voltage is increased, and theoretically, the capacitor can be made to have a high withstand voltage.

However, in the capacitor described in -1-, the lead wire 7.8 is welded to the surface of the metal foil to draw out the electrode.
Since it is used by winding it up, there is a problem that the winding workability is poor and the production t1 is low.

In addition, as a characteristic problem caused by the lead wire 7.8 being wound up, the withstand voltage level of the dielectric film l near the welded part of the lead wire at the beginning and end of the first turn becomes low, and the actual withstand voltage of the capacitor is lower than the theoretical one. The pressure resistance is inferior to that of the standard. This means that when the lead wire and dielectric film are overlapped and rolled up, the mechanical stress that the film is subjected to, and especially when the dielectric film overlaps the lead wire, the number of windings is reduced. This is because when the dielectric film is small, the dielectric film is bent and distorted by the wire diameter of the lead wire, and the electric field is concentrated in this area, causing the withstand voltage level to drop.One way to prevent this drop in the withstand voltage level is to
There is also a method of inserting a dielectric film for voltage resistance compensation at the lead wire connection position, but it is not common because it is not productive and the balance with other capacitances that are connected in series is disrupted. There are some drawbacks.

Furthermore, since the welded part between the metal foil and the lead wire has a certain resistance value, when high voltage is repeatedly applied, the welded part generates heat due to the resistance, causing thermal deterioration of the A heavy film and reducing the withstand voltage. There was also a risk of a decline in the result,
There was also the problem that reliability as a capacitor was low.

OBJECTS OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned drawbacks, prevent a low breakdown voltage of a capacitor having a high breakdown voltage structure, increase productivity, and provide a highly reliable capacitor.

Structure of the Invention In order to achieve the above-mentioned object, the capacitor of the present invention has a plurality of electrodes made of 1 m of gold individually insulated in the length direction arranged on both sides of a dielectric film, and each electrode is This dielectric film and another dielectric film are overlapped and wound, and the two electrodes made of adjacent metal layers on the facing side are arranged so as to be directly aligned with each other. A metal foil is used for the electrode, and the end of the metal foil at the beginning of the winding is placed outside the end of the dielectric film, and the metal foil at the end of the winding is wound around the outermost circumference to form a capacitor. However, these two metal foils were used as electrode extensions.

As mentioned above, since the electrode lead wire is made of metal foil, there is no need to worry about winding up the electrode lead wire as in the conventional case, and the winding operation of the capacitor element R is extremely easy. In addition, the mechanical stress to which the dielectric film is subjected is small, and the dielectric film has no distortion caused by bending over the entire length of the capacitor, from the beginning of winding to the end of winding.
There is no concentration of world. Furthermore, since the metal foil is reliably connected to the wire, there is little heat generation even when high voltage is repeatedly applied, and there is no thermal deterioration of the film.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 4, i5, and 6.

In FIG. 4, a metal layer 2 and a metal layer 4 are formed as electrodes on both sides with a required distance 3 between them.

5 is another dielectric film. These structures are the same as the conventional example shown in FIG. The feature of the present invention is that metal foils 6 and 6' are used, and when the dielectric film 1 and the dielectric film 5 are wound to form a capacitor, they face each other at the beginning and end of the winding Ii5. Part 9 and opposing part 1
It is used as one of the electrodes forming 0.

As shown in FIG. 5, the metal foil 6 also has one of its widthwise ends protruding outward from the dielectric films 1 and 5 at the beginning of winding. Like A! Similarly, the metal foil 6' is wound in several layers around the outermost periphery of the capacitor element at the end of the winding, as shown in Figure $6. Two metal foils, the metal foil 6 that has been wound and protrudes from the end of the capacitor element, and the metal foil 6' that has been wound around the outermost periphery, are used as electrode extensions of the capacitor.

As shown in L, since the metal foil 6 and metal foil 6' are used as the electrode lead of the capacitor, the productivity is much higher than the conventional structure in which the Riet wire is welded to the surface of the metal foil and wrapped around it. Headed to -1-shita. Furthermore, compared to the conventional example, the mechanical stress generated on the dielectric film 1 and the dielectric film 2 during winding is reduced, and at the beginning and part of the end of the first roll: the A-tube filter is bent. Therefore, there is no need to worry about durability or deterioration due to concentration of electric fields. Furthermore, thermal deterioration of the dielectric film due to heat generated at the welded portion of the lead wires does not occur.

Figure 7 shows y1 of capacitor A with the structure of the present invention and capacitor B with a conventional lead wire wrapped around the electrode.
This shows the results of a pressure fracture test.

Figure 8 shows the survival rate (number of failures/number of tests) over time in a test in which a voltage of 1.4 times the rated 0-P voltage was repeatedly applied to capacitor A of the present invention and capacitor B of conventional structure in an atmosphere of 85°C. It shows a 4aS transition.

In FIG. 7 and FIG. ff18, it is demonstrated that the withstand voltage effect obtained by the electrode lead-out structure of the present invention is good.

Although the embodiment described above shows a case in which vapor-deposited metal is used as the electrode layer of each capacitor element, it is also possible to deposit a conductive layer on a dielectric film or to construct it with a metal foil.

As described in the description of the effects of the invention, in the capacitor of the present invention, a plurality of insulated electrodes are arranged on both sides of the dielectric film in the length direction, and each electrode is connected to two adjacent electrodes facing each other. It has a high voltage withstanding structure in which it is placed so as to overlap with another dielectric film and is wound with another dielectric film, and metal foil is used for the electrodes at the beginning and end of the winding, and the end of the metal foil at the beginning of winding is connected to the dielectric film. The metal foil at the end of the winding is wound around the outermost circumference, and these two metal foils are used as electrode extensions.Therefore, the withstand voltage, which was a drawback of conventional high-voltage structure capacitors, is reduced. It has been possible to provide a high-voltage film capacitor that can prevent the level from decreasing and improves productivity, and is inexpensive and highly reliable.

Although the above explanation shows the case where only one dielectric film 1 is disposed, it is also possible to arrange multiple dielectric films one on top of the other. can be further improved.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the configuration of a conventional capacitor. Figure 2 is an enlarged perspective view with a part of the conventional capacitor opened.
The figure shows its equivalent circuit, Figure 4 is an IJJ diagram showing the configuration of the capacitor of the present invention, Figure 5 is an enlarged perspective view showing the capacitor of the present invention in the middle of winding, and Figure 6 shows the end of winding. FIG. 7 is a graph showing the breakdown level of the capacitor of the present invention and the conventional capacitor in the boost breakdown test.
FIG. 8 is a graph showing the time course of the survival rate of the capacitor of the present invention and that of the conventional capacitor after repeated high voltage application tests. 1.5...Dielectric film 2.4...Metal layer color i-pole 6,6'...Metal foil agent Patent attorney Oshima-ko Figure 5 Figure 6 Figure 7 Tuna Ichi ( Hr)

Claims (1)

[Claims] Electrodes made of a plurality of individually insulated metal layers are arranged on both sides of the U-heavy film in the length direction, and each electrode is arranged so as to overlap two electrodes made of mutually adjacent metal layers on the opposite side. , this dielectric film and another, 1
ili body films are overlapped and wound, metal foil is used for the electrodes at the beginning and end of the winding, and the end of the metal foil at the beginning a is arranged outside the end of the dielectric film, and
A capacitor characterized in that a metal foil (W) at the end of the winding is wound around the outermost circumference to constitute a capacitor, and these two metal foils are used as electrode extensions.